The Dallas Cowboys' medical staff has cleared quarterback Tony Romo to begin practicing when training camp starts on Sunday, according to sources.

Romo underwent minor surgery to have a non-cancerous cyst removed from his back in April. The surgery prevented Romo from participating in offseason workouts other than some light throwing in walk-through practices.

Romo and team officials have said he wasn't practicing as more of a precaution.

"I feel a lot better," Romo said in May when asked about the surgery. "It was something that was there a little bit, kind of annoying. I'd rather feel 100 percent here. Hopefully I'll be back for minicamp and be ready to go, but we're just being smart now for the next couple of weeks."

But Romo didn't return for minicamp, and the Cowboys let backup quarterback Kyle Orton take snaps with the first-team offense.

Romo, who signed a six-year extension this spring worth $108 million with $55 million guaranteed, will have more influence with the Cowboys' offense in 2013.

He finished the 2012 season third in passing yards (4,903) and passing attempts (648) and sixth in touchdown passes (28).